android/source/src/java/org/libreoffice/LocaleHelper.java

   1 package org.libreoffice;
   2
   3 import android.content.Context;
   4 import android.content.SharedPreferences;
   5 import android.content.res.Configuration;
   6 import android.content.res.Resources;
   7 import android.os.Build;
   8 import android.preference.PreferenceManager;
   9
  10 import java.util.Locale;
  11
  12 public class LocaleHelper {
  13
  14     private static final String SELECTED_LANG = "org.libreoffice.selected.lang";
  15     // value for language that indicates that system's default language should be used
  16     public static final String SYSTEM_DEFAULT_LANGUAGE = "SYSTEM_DEFAULT_LANGUAGE";
  17
  18     public static Context onAttach(Context context){
  19         String lang = getPersistedData(context, Locale.getDefault().getLanguage());
  20         return setLocale(context, lang);
  21     }
  22
  23     public static Context setLocale(Context context, String lang) {
  24         persist(context, lang);
  25         return updateResources(context, lang);
  26     }
  27
  28     @SuppressWarnings("deprecation")
  29     private static Context updateResources(Context context, String lang) {
  30         Locale locale;
  31         if (lang.equals(SYSTEM_DEFAULT_LANGUAGE)) {
  32             locale = Locale.getDefault();
  33         } else {
  34             locale = new Locale(lang);
  35         }
  36         Locale.setDefault(locale);
  37
  38         Resources res = context.getResources();
  39         Configuration cfg = res.getConfiguration();
  40         cfg.locale = locale;
  41         cfg.setLayoutDirection(locale);
  42
  43         res.updateConfiguration(cfg, res.getDisplayMetrics());
  44         return context;
  45     }
  46
  47     private static void persist(Context context, String lang) {
  48         SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
  49         preferences.edit().putString(SELECTED_LANG, lang);
  50         preferences.edit().apply();
  51     }
  52
  53     private static String getPersistedData(Context context, String lang) {
  54         SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
  55         return preferences.getString(SELECTED_LANG, lang);
  56     }
  57 }